Something seems wrong im this article. The side-by-side comparison shows 4 formats:

  · Original PNG image (2.6 MB)
    · Name "high_fidelity.png", but in fact 298.840 bytes and format: JPEG
  · JPEG XL (default settings, 53 KB): indistinguishable from the original
    · Name "high_fidelity.png.jxl.png", but in fact 3.801.830 bytes and format: PNG
  · WebP (53 KB): some mild but noticeable color banding along with blurry text
    · Name "high_fidelity_webp.png", but in fact 289.605 bytes and format PNG
  · JPEG (53 KB): strong color banding, halos around the text, small text hard to read
    · Name "jpeg_high_fidelity.jpg", but in fact 52.911 bytes and format JPEG

The comparison does not make any sense, everything is just wrong. Also when encoding the large original PNG image to AVIF, it has only 20.341 Bytes with no visual change, see: http://intercity-vpn.de/files/2024-10-27/upload/